Depends on your usage
I think the answer really depends upon the type/length of non-riding situation you foresee for your Spyder. Since you live in Georgia, I assume you're likely to be riding it most of the year, and not really thinking of winter storage, per se. If you are going to lay the Spyder up for several months without using it, then maybe a warmer indoor storage location might be worth the cost, if it's within your budget. Plenty of guys in the south do just use a cover though, and seem to survive OK.
I have had my 2017 Spyder for a year and a half now. In all that time, It has never seen a garage or closed in space for a single night. I'm Canadian, but spend winters with my Spyder in mid-Florida, so it doesn't see snow or really freezing temperatures, though there are cool and/or wet days in both places. My bike sometimes gets to sit under a carport, but more often than not it's outside under a cover. At first, I used BRP's snug-fitting trailering cover; then I switched to a looser style, full cover by Nelson-Rigg. Either one keeps the rain off just fine; no moisture build up underneath. Also keeps the hot sun from beating down all day. I have had no bad issues.
Barely a week goes by that I don't ride 2 or 3 days, sometimes more. The cover comes off and goes back on fairly frequently, so I don't seem to experience any critter attacks or build-up. I did get some unwanted wear on my paint from trailering one time, and won't use a cover for that any more - if the Spyder gets wet or dirty on the road, it just gets washed and dried at the end of the trip.
So, my answer would be... storage cover depends on what your goal is. Are you looking for simple but adequate short-term or overnight protection or to prevent abuse from UV sunlight and inclement weather? Or, are you in need of longer-term storage during lay-up? If the latter, then you have good comments above from others. But short-term, intermittent use of a portable cover may do, and probably without creating rust or critter issues, etc.